The sound system of Norwegian resembles that of Swedish. There is considerable variation among the dialects, and all pronunciations are considered by official policy to be equally correct – there is no official spoken standard, although it can be said that Eastern Norwegian Bokmål speech (not Norwegian Bokmål in general) has an unofficial spoken standard, called Urban East Norwegian or Standard East Norwegian (Norwegian: standard østnorsk), loosely based on the speech of the literate classes of the Oslo area. This variant is the most common one taught to foreign students.